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Just in case you wind up unscrewing the wrong thing, I would turn the tank upside down so the juice won't spill all over the mod. Then, using Cany's suggestion, try using something rubbery for better grip to try to unscrew the tank off. If you don't have anything else, a rubber band wound around the base of the tank will also give you gripping power.

Nope. If I were you I would reflect colored lights at the cloud. my quick answer, without a terrible amount of thought, is that in order to produce color the vapor would have to contain particles. And that's not good. Vapor is essentially liquid that is atomized - it's a true cloud. It looks white because of natural reflection of light off tiny "water" particles. In order for the cloud to appear red, for example, you have to beam it with red light, or, it has to have particle matter that reflects red light only from white light. You don't want anything to do with inhaling particles of matter like that. Not just a bad idea, but possibly fatal if it's even feasible.

Try grabbing the bottom section of the tank with something rubbery/gripy like one of those garlic peeling matts